Splicing construction method for large-span suspension bridge

Abstract

The invention discloses an assembling construction method for a large-span suspension bridge. After suspension rods of the suspension bridge are installed, active counter weights are sequentially installed at the corresponding positions of the suspension rods on the main cable from the midspan to the side span, the stress reaches the expected bridge forming state, main beam sections are sequentially erected from the side span to the midspan, the corresponding active counter weights are unloaded according to the equivalent replacement principle in the erecting process, and the stress of the main cable is kept constant till closure is achieved. And in the main beam erecting stage, main cable wire winding and protection and cable clamp final tightening and fastening operation can be synchronously carried out, and parallel construction of multiple working faces is achieved. According to the method, active balance weight is used for equivalently replacing loads mainly including a main beam, a bridge deck and bridge deck pavement, the stress of the main cable is kept in an expected bridge forming state all the time, according to the rule, the main beam can be continuously erected in a rigid connection mode without a temporary hinge, main cable winding and protection and cable clamp final tightening and fastening operation can be synchronously conducted after the main beam is erected, and parallel construction of multiple working faces is achieved. The construction efficiency can be improved, the high-altitude operation risk is reduced, and the characteristics of quickness, high reliability and the like are achieved.

Description

Technical field[0001]The present invention belongs to the construction technology of suspension bridges, and specific relates to a large span suspension bridge assembly construction method.Background technique[0002]The traditional suspension bridge construction method generally uses a cable hanging system. After the maintenance of the cable and the homogeneous frame, the main beam segment near Soda, the cable crane will lifting the assembled main beam segment to the position of the installed position. The technology of cable hangers has been used in large-area bridge construction, technology maturation, and the traditional suspension bridge construction method generally uses this method from cross-directional construction, with a large number of high-altitude operations, and large temporary structures The engineering economy becomes low.[0003]Further, from the perspective of the main cable protection, the use of traditional construction methods from cross-crossing construction will ...

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Problems solved by technology

[0003] Furthermore, from the perspective of main cable protection, using traditional construction methods to construct from the middle span to the side span will delay the winding operation of the main cable and reduce the construction efficiency. From the perspective of construction integrity, construction from the middle span to the side span As a result, the installation and construction of the bridge deck needs to be carried out after the erection of the main girder is completed. If the construction of the bridge deck is carried out synchronously, it is necessary for the workers to start construction at the suspended main girder section, which is highly dangerous.

[0004] Furthermore, the existing literature "Key Technologies for Construction of Steel Truss Stiffened Beams of Baling River Bridge" has a method of side-span to middle-span construction, but because the stress of the main cable keeps changing during the construction process, the true meaning of the main girder segment cannot be realized. For the continuous rigid connection construction on the top, it is necessary to set up temporary hinges to adjust the alignment and then rigidly connect the main beam segments, and the process is procrastinated

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